/Engine/Source/Runtime/Experimental/Chaos/Public/RewindData.h
Called before any inputs are marshalled over to the physics thread. The physics state has not been applied yet, and cannot be inspected anyway because this is triggered from the external thread (game thread) Gives user the ability to modify inputs or record them - this can help with reducing latency if you want to act on inputs immediately
virtual void ProcessInputs_External ( int32 PhysicsStep, const [TArray](API\Runtime\Core\Containers\TArray)< [FSimCallbackInputAndObject](API\Runtime\Chaos\Chaos\FSimCallbackInputAndObject) > & SimCallbackInputs )